package com.dang.web.servlet;


import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dang.model.Book;
import com.dang.model.Category;
import com.dang.model.Product;
import com.dang.service.CategoryServiceFactory;
import com.dang.service.ProductService;
import com.dang.service.ServiceDAOFactory;

@WebServlet("/main.do")
public class MainServlet extends HttpServlet {

	private static final long serialVersionUID = -4929276394996109832L;

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doPost(req, resp);
	}

	@Override
	protected void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
		String method=req.getParameter("method");
		Map<String,List> datas=new HashMap<String,List>();
		if(method!=null){
			switch(method){
			case "1":
				productDetail(req,resp);
				break;
				default:
					break;
			}
		} else{
			initCategory(datas);
			initHotBooks(datas);
			initNewBooks(datas);
			initRecommend(datas);
			req.setAttribute("datas", datas);
			req.getRequestDispatcher("/WEB-INF/veiw/home/main.jsp").forward(req,resp);
			}
		}

	private void productDetail(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		Book book=null;
		try{
			String id=req.getParameter("id");
			if(id!=null){
				book=(Book)ServiceDAOFactory.getProductService().findById(new Integer(id));
			}
		}catch(Exception e){
			e.printStackTrace();
		}
		req.setAttribute("book", book);
		req.getRequestDispatcher("/WEB-INF/veiw/home/product.jsp").forward(req, resp);
	}
	private void initNewBooks(Map<String,List> datas){
		List<Book> books=new ArrayList<Book>();
		try{
			for(Product p:ServiceDAOFactory.getProductService().findByNew(4)){
				books.add((Book) p);
			}
			datas.put("newBooks", books);
			
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	private void initHotBooks(Map<String,List> datas){
		List<Book> books=new ArrayList<Book>();
		List<Product> pros;
		try{
			pros =ServiceDAOFactory.getProductService().findByHot(4);
			for(Product p:pros){
				books.add((Book) p);
			}
			datas.put("hotBooks", books);
		} catch(Exception e){
			e.printStackTrace();
		}
	}
	private void initRecommend(Map<String,List>datas){
		List<Book> books=new ArrayList<Book>();
		ProductService productService=ServiceDAOFactory.getProductService();
		try{
			books.add((Book) productService.findById(new Random().nextInt(20)+1));
			books.add((Book) productService.findById(new Random().nextInt(20)+1));
			datas.put("books", books);

		} catch(Exception e){
			e.printStackTrace();
		}
	}
	private void initCategory(Map<String,List> datas){
		List<Category> cats;
		try{
			List<Category> list=CategoryServiceFactory.getCategoryService().findAll();
			cats=findByParentId(list,1);
			for(Category c:cats){
				c.setSubCats(findByParentId(list,c.getId()));
			}
			datas.put("category", cats);
		}catch(Exception e){
			e.printStackTrace();
		}
	}
	private List<Category> findByParentId(List<Category> list,int id){
		List<Category> subCats=new ArrayList<Category>();
		for(Category c:list){
			if(c.getParentId()==id){
				subCats.add(c);
			}
		}
		return subCats;
	}
}
